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In the 70s, the discovery of a constant loss of acetylcholine (Ach) in the brains of people suffering from dementia led to the development, in order to improve cognitive functions, of drugs that increased Ach levels. The possibility that loss of a given neurotransmitter might be associated with the onset of a specific neurological syndrome led to suggestions that, as had already been found in Parkinson's disease, replacement therapy might drastically improve the course of the syndrome. We arepmid:12224797 fatcat:arus3dplwnexpf5kuhwdt7cnei